// string
const color: string = "blue";

// number
const decimal: number = 6;
const hex: number = 0xf00d;
const binary: number = 0b1010;
const octal: number = 0o744;
const big: bigint = 100n;

// boolean
const isDone: boolean = false;

// undefined
const u: undefined = undefined;
const n: null = null;

// unknown 的用法：，unknown 是一个 "严格" 版的 any。
let un: unknown;

// never
const func = () => {
  throw new Error();
};

// any
const looselyTyped: any = 4;
